4
SACCONE IS THE COOLEST Notes of Interest All of these wastes are poisons at high concentrations Urine- is a liquid waste composed of water, urea, and salt Don’t confuse excretion with egestion - egestion (defecation)- is the removal of feces from the digestive tract

5
SACCONE IS THE COOLEST Adaptations for Excretion

6
SACCONE IS THE COOLEST Protista Excretion is accomplished by diffusion through the cell membrane Major waste products are ammonia and CO 2 Contractile vacuole- is used to remove excess water from the organism

7
SACCONE IS THE COOLEST Protista Excretion is accomplished by diffusion through the cell membrane Major waste products are ammonia and CO 2 Contractile vacuole- is used to remove excess water from the organism

8
SACCONE IS THE COOLEST Plants Excess gases diffuse out of the plant through stomates of the leaves, the lenticels of the stems, and the root hairs of the roots Major waste in plants is oxygen

9
SACCONE IS THE COOLEST Hydra Like protozoa, excretion of wastes is by diffusion The major wastes are ammonia and CO 2

10
SACCONE IS THE COOLEST Hydra Like protozoa, excretion of wastes is by diffusion The major wastes are ammonia and CO 2